1.

Intensity level of sound whse intensity is 10^(-8) Wm^(-2) is ..... dB

Answer»

8
4
40
80

Solution :Intensity level of intensity `10^(-8) ` watt/`m^(2)` is
L = 10` LOG" " (I)/(I_(0))`
= 10 ` LOT (10^(-8))/(10^(-12)) = 10 log 10^(4)`
= 40 dB.
so correct choice is (c) .


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